|
|
Posted by Erwin Moller on 06/13/06 08:58
julian_m wrote:
> I've a site working as follows
>
> Table "articles"
> [id]
> [name]
> [...more fields]
>
> When somebody want to see the article's details, I generate (thorugh
> php) a page where all the detalis are listed, as well as the article's
> views (images)
>
> If the articles's id is $id, then, I search for its images this way:
>
> for ($i=1;$i<11;$i++){
> $filename= $path.$id.'_'.$i.'.jpg';
>
> if (file_exists($filename)) {
> Show the image here
> }
>
> }///for
>
>
> This let me upload from 1 to 10 views, and show them as long as they
> are in the sever
>
> Pretty easy as you can see, but, the problem is that there could be (in
> fact, there will be) more that 10000 images in the same directory.
> I'm wondering whether there will be some kind of speed-problem with
> file_exists function using it to search among such a number of files...
>
> Had anyone experiences/problems with this ?
>
> regards - jm
Hi,
Good question.
If PHP is scanning through the directory 10 times in a row, you are clearly
wasting precious CPU.
Some OS's can be helpfull by having their filesystem indexed, making your
approach doable.
I think you could do a general faster job by trying to match a substring to
the filename in a certain directory, and do it once, not 10 times.
That is sometimes refered to as 'globbing'.
I know this from Perl, but I just saw it exists in PHP under the name....
glob. What a surpise. ;-)
So go to www.php.net and look for the function glob.
Good luck
Regards,
Erwin Moller
Navigation:
[Reply to this message]
|